CVE-2021-3405
MEDIUMCVSS 6.5/10EPSS 1.74%
Last modified
CVE-2021-3405 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.. EPSS estimates a 1.74% chance of exploitation in the next 30 days.
Description
A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Matroska | Libebml | < 1.4.2 |
| Fedoraproject | Fedora | 32 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
| Debian | Debian Linux | 9.0 |
References
- https://github.com/Matroska-Org/libebml/issues/74Exploit, Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/04/msg00016.htmlThird Party Advisory
- https://security.gentoo.org/glsa/202208-21Third Party Advisory
- https://github.com/Matroska-Org/libebml/issues/74Exploit, Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/04/msg00016.htmlThird Party Advisory
- https://security.gentoo.org/glsa/202208-21Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3405?
A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.
How severe is CVE-2021-3405?
CVE-2021-3405 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.74% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3405?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3405?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST